A Google Account may be created using any standard email address that can receive mail. Because of this, you may have used your G Suite email address to create a conflicting account. A conflicting account is a personal Google Account that was created using the email address of a G Suite account. For this reason, any G Suite user could have two accounts with the same email address.
Here's a common scenario
- Jane decides to go to www.google.com/photos and creates a Google Account with her corporate email address 'Jane@altostrat.com.'
- Jane's company, Altostrat, upgrades to G Suite -- which means each employee's email address is now that employee's username for a corporate Google Account.
- Jane now has two Google Accounts -- one G Suite account, and one Google Account, that share the same primary email address, but are completely unrelated.
The most common reason that you may have a conflicting account is that you used Google Reader, Google Voice, or Picasa Web Albums with your @my-domain.com email.